Thermostatic burglar-alarm system



S. B. HESS. THERMOSTATIC BURGLAR ALARM SYSTEM.

APPLICATION FILED APR. 8, 19l8- INVENTOR.

um'rsu STATES PATENT- OFFICE.

SIMON B. HESS OF JAMAICA, NEW YORK.

THEBKOSTATIC BURGLAR-ALARM SYSTEM.

To all whom it may concem:

Be it known that I, SIMON B. Hess, a citizen of the United States,residing at Jamaica, in the county of Queens and State of New York, haveinvented certain new and useful Improvements in ThermostaticBurglar-Alarm Systems, of which the following is a specification. a.This invention relates to electrlc burglar alarm systems of the classemployed for the v protection of banks, stores, and the like, and it isan object of this invention to provide novel means whereby the personmanipulating the system is enabled to leave the guarded structure by anyexit wlthin a certain time after setting the alarm without actuating thesignal.

This invention consists in the general combination of parts and detailsdescribed hereinafter, all of which contribute to produce an effectivebur lar alarm system.

A preferred embo iment of my inventlon is described in the accompanyingspecification, while the scope of the protection con templated ispointed out in the claims.

In the drawing, the dotted rectangle B incloses a dia rammaticrepresentation of the instrument oard as seen from the rear, G indicatesthe wiring in the guarded structure, and S represents the alarm signal.

Referring particularly to the lnstrument board B, thearmature 15 ismounted be tween the magnet coils 11, 13 and the magnet coils 17, 18.The magnet c0118 11 and 13 and 17 and 18 are so constructed and arrangedthat either coil 11 or 13 is able to move said armature 15 away fromcontact 14 to its attracted position when coils 17 and 18 are notenergized and is able to retain said armature in its attracted positiona ainst the attraction of coils 17 and 18 w an said'coils are energized.Test button 19 is adapted to open switch 20 and close switches 21 and22. Look 42 is provided with an indicator .38 adapted to project throu ha-slot 37 in the front of the instrument oard and in one position (shownin the drawing) is adapted to hold switch contact 40 in engagement withcontact 39. When moved to its opposite position, indicated by the dottedlines, switch contact 40 is moved out of engagement with contact 39 andinto engagement with contact 41 and lever 43 is moved into position tobe engaged by the .hooked'end of a thermostatic Specification of LettersPatent.

Application iiled April 8, 191 8. Serial No.

( 81 a current Patented Jan. 18, 1921. 227,256.

metal arm 35, bearing a heating winding 36.

ever 43 bears two insulating wedges 44 WhlCh are adapted to hold openthe switches 45 and 46 when the lever is retained by the hooked end of'arm 35 against the tension of spring 50. Reset button 53 is mounted inthe bottom of the instrument board and. is arranged to close switch 52.When the instrument board is attached to its mounting on a wall or othersurface the contact plate 56 secured to the instrument board is adaptedto engage contact plate 57 which is secured to the mounting.

eferring to the apparatus shown associatedwith the alarm signal S,armature 89 s mounted between the coils 93 and 94 and 1s adapted to beattracted by either coil and, as it is not biased, it will remain in theposit1on to which it was last moved.

In the position shown in the drawing, the protective circuit (1) iscomplete and (the bolt of the lock 42 having just been moved from itsdotted line position to its solid line position) the'heating circuit (2)is also complete. These circuits are as follows :(1) from right handterminal of battery 81, to junction 83, "conductor 61 in the guardedstructure, terminal 62, on the instrument board, conductor 63, coil 11,junction 12, coil 13, conductor 66, terminal 65, conductor 64 in theguarded struc ture, .to left hand terminal of battery path also existsfrom junction 12, along conductor 77, switch 20, junction 16, conductor76, terminal 75, conductor 74, to center of battery 81, but as this pathis merely the neutral of the typical threewire circuit the currentthrough coils 11 and 13- is not affected by this path except when thereis a break in one or the other of the conductors 61, 64 (2) from righthand terminal of battery 86, to junction 87, conductor 70, terminal 71,conductor 51, lever, 43, arm 35, winding 36, junction 33, conductor 32,contact 39, contact 40, conductor 55, junction 29, plate 56, plate 57,conductor 58, junction 85, to left hand terminal of battery 86.

The manipulator of the system may now leave the protected premises byany exit, providing only that the exit is closed and circuit (1) abovetraced is recompleted before the heating of thermostatic arm 35 by thewinding 36 in the circuit (2) above traced becomes sufficient to causesaid arm armature 15 has already -45 and 46.

. tion 83, conductor release said lever.

When the hook on the end'of arm releases the lever 43, the force ofspring 50 causes circuit (2) to be broken between arm 35 and lever 43and by withdrawing the wedges 44 permits the closing of switches Theclosure of switch 46 completes the following circuit :-(3) from righthand terminal of battery 81, to unc- 59, terminal 60, conductor 27,junction 28, conductor 31, switch 46, conductor 47, junction 24,conductor 79, coil 18, coil 17, 'unction 16, conductor 76, terminal. 75,con uctor 74, to center of battery 81. Upon the closure of circuit (3)the coils 17 and 18 become energized, but as been moved toward coils 11and 13, the attraction of coils 17 and 18 has no operative effect uponsaid armature. The apparatus is now 1n the night or set condition, whilethe opening of circuit (2) permits the coollng of the thermostatic arm35 and allows the hooked end thereof to bend back into position toengage lever 43 when the bolt of the lock 42 is again actuated.

When the premises are entered in the morning (which is represented by abreak in both the conductors 61, 64) or in the event of an intrusionupon the guarded structure (which would result either in a breaking ofboth the conductors 61, 64, or in a shuntlng of said conductors) both ofthe coils 11 and 13 would become deenergized, permitting the-movement ofarmature 15 away from coils 11 and 13 and toward 0011s 17 and 18 andinto'engagement with contact- 14, thus closing the followin circuit (4)from right hand termina of battery 86, to junction 87 conductor 88,armature 89, contact 90, conductor 95; signal coil 94, conductor 67,terminal 68, conductor 69, contact 14, armature 15, conductor 78,junction 26, conductor 48, switch 45, conductor 34, junction 33,conductor 32, contact 39, contact 40, conductor 55, junction 29, plate56, plate 57 conductor 58, junction 85, to left hand terminal of battery.86. Upon the cloment with contacts 91' and 92.

sure of circuit (4) the signal coil 94 becomes energized and movesarmature 89 out of engagement with contact 90 and into engage- Themovement of armature 89 outof en-. gagement with contact 90 causes thebreak- ,ing of circuit (4) and the movement of said armature intoengagement with contact 92 closes the alarm slgnal circuit as follows(5) from right hand terminal of battery 86, to junction 87, conductor88, armature 89, contact 92, conductor 96, alarm signal S, conductor 98,junction 85, to left hand terminal of battery 86.

After the alarm si nal has thus been set 'in operation it may e stoppedin the following manner :--The bolt of the lock is moved from theposition shown in the drawing (its extreme left hand position) to itsextreme right hand. osition (indicated by the dotted lines). hewithdrawal of the bolt from switch contact 40 permits said contact tomove out of engagement with contact 39 thus making another break incircuit (4)) and into engagement with contact 41. The movement of theother end of the bolt against lever 43 causes said lever to be movedinto position to be engaged by the hooked end of arm 35 (thus closingone break in circuit (2)) and causes wedges 44 to open the switches 45and 46 (thus making another break in circuit (4) and breaking circuit(3) The reset button 53 is then pressed u ward, closing switch 52 andcompleting t e following circuit :-(6) from i out of engagement withcontacts 91 and 92' and into engagement with contact 90, openingcircuits (6) and (5) and closing one break in circuit (4). The openingof circuit (5) stops the operation of the alarm signal. The apparatus isnow in the day or unset position.

The test button 19 is provided to enable the person in charge of thepremises, or any other person, to test the apparatus without using thelock and also without using the thermostatic arm and then being requiredto wait for it to cool. The test is made as follows :-Assuming all exitsclosed, circuit (2) is open between contact 39 and contact 40; circuit(3) is open at switch 46; circuit (4) is open at switch 45, also betweencontact 39-and contact 40; circuit (5) is open between armature 89 andcontact 92; and circuit (6) is open between armature 89 and contact'91,also at switch 52. If now, test button 19 is pressed, the neutral of thecircuit for coils 11 and 13 is opened at switch 20; the break in circuit(3) at switch 46 is shortcircuited via junction 28, switch 21, conduetor23, to junction 24; the breaks in circuit (4) at switch 45 and betweencontact 39 and contact 40 are short-circuited via junction 26, conductor25, switch 22, conductor 30, to junction 29. If either conductor 61 or64 is broken or if these two conductors are crossed, or if battery 81 isof insufiicient strength, armature 15' is not moved out of engagementwith contact 14, and circuit (4) is completed, causing the energizationof signal coil 94, the closing of alarm signal complete and that battery81 is of sufficient strength. However, the non-operation of alarm signalS might be due to a failure of battery 86, signal coil circuit (4), oralarm,

signal circuit (5). This mag;

be tested by opening any exit and therea er depressing test button 19.If the alarm signal now operates, it is evident that batter 86, signalcoil circuit (4) and alarm si a circuit (5) are in operative conditionan hence the nonoperation of alarm signal S on the first'test 'showedthat the protective conductors 61 and 64 were complete and that battery81 was of suflicient strength.

In case there is a break in one of the conductors 61 or 64, the alarmsignal S willbe operated when the system is tested in the manner justdescribed, but even while in this condition the system may be set andprotection obtained, because the armature 15 will be moved to itsattracted position 'when the lock is moved to the set position and willremain in attracted position as long as the other protective conductoris intact. When the building is entered this other conductor will bedisturbed and the alarm will be sounded.

In case there is a break in both of the conductors 61 and 64, or the twoconductors are crossed, or thebattery 81 is not of sufficient strength,the alarm signal S will be operated when the system is tested, and whenthe system is set the manipulator thereof will barely have stepped awayfrom the last closed exit when the alarm signal will be operated, thusgiving an' immediate indication of th fact that the alarm system is outof order.

As shown, test button 19 is arranged to operate three independentswitches 20, 21, and 22. It will be evident to one skilled in the button53 to close switch 52. If

art, that, by reversing that part of circuit (3) between junction 28 andjunction 16,

switches 20 and 21 may be combined into one switch having both an upperand a lower contact, the arm of the switch being common to circuit (3)and to the neutral of circuit be time interval of the thermostatic arm35 may be varied by changing the construction of the arm itself or bchanging the resistance of the heating C011 36, and it is evident thatthe device should be so arranged thatthe manipulator of the system willhave sufiicient time to leave the uarded structure and close the exitbehind hlIIl before the arm operates to release the lever 43.

What I claim and desire to secure by Letters Patent of the'United Statesis:-

- 1. In a burglar alarm system, electromag netic means included in aprotective circuit, an alarm circuit, a switch therein controlled bysaid electromagnetic means, a second switch therein, andthermostatically retarded means for closing said second switch connectedin parallel with said second switch.

2. In a burglar alarm system, electromag netic means included in aprotective circuit, a second electromagnetic means included in a bypassin parallel with said first electromagnetic means, and retarded closingmeans for said bypass.

3. In a burglar alarm system, electromagnetic means included in aprotective circuit, a second electromagnetic means included in a bypassin parallel with said first electromagnetic means, and thermostaticallyretarded means for closing said bypass.

4. Ina burglar alarm system, circuit closing means, a circuit thereforincludin an alarm, an electromagnet to actuate sai circuit closingmeans, and thermostatlcally reactuating electromagnet connected inparallel with said actuating electromagnet.

SIMON B. HESS.

